Romn60AE

I was an Chief Aviation Electricians Mate on H-60B/F/H/R/S for 17 years and can tell you that all Navy H-60 engine bays are bare aluminum on the bottom and inboard side . The front is actually part of the intake and is part bare aluminum and part fiberglass. The aft part and the exaust itself are titanium, thats why the back part of the last pic poasted looks gray, Titanium is not coated on Naval aircraft as it forms an oxide on its surface that is tougher than any coating and gives it a dull aperance. The door is kevelar with a fiberglass honeycomb core. Hope that helps.